Thermoplastic slider



Nov.28, 1939. D. MARlNSK Y 2.181,l42

. THERMOPLASTIC sLIbER Filed March 6, 1937' v 2 Sheets-Sheet l INVENTOR fla /5 MFA sky ATTORNE Nov. 28, 1939. MARINSKY THERMOPLASTIC SLIDER Filed March 6, 1937 2 Sheets-Sheet 2 V .m N 7 w mm 5 Patented Nov. 28, 1939 2,181,142 umreo sures; PAT" OFFICE]- THERMOPLASTIC supra Davis Mai-ma Bronx, N. Y., assignorto-Whitehall Patents Corporation, Bronx, N. X., a corg p poration ofNewYoi-k I ApplicationMarch o, 1937, Serial No. 129,919 '7 Claims. (01.24-295) This'inventionrelates to sliders on what are I known as separable fasteners employing string ers having interlocking links whereby the string ers may be coupled and uncoupled by longitudinal movement of the slider on said stringers or the coupling links thereofland the object of the invention is tov provide a slider adapted primarily for use on separable fasteners employing plastic or thermoplastic coupling links, thus providing a slider formed from plastic or thermoplastic material and particularly to the manner in which the slider is originally formed to facilitate detachment of the finger piece or pull; a further object being to provide a slider formed from a resilient or springy material, such for example as cellulose acetate, whereby the pull supporting part of the slider may be provided with a locking element and be movable relatively to one side wall of the slider; a still further object being to provide a pull having a rounded part engaging the supporting or locking elements of the slider to control the movement of said element into locked and unlocked position; and with these and other objects in view the invention consists in a slider made according to the method more fully hereinafter described and claimed. W

The invention is fully disclosed in the following specification,- of which the accompanying drawings form. a part, in which the separate parts of my improvement are designated by suit: able reference characters in each of the views, and in which: 1 Fig. 1 is a plan'view of a separable fastener showing one ofmy improved sliders thereon.v

Fig. .2 is a longitudinal sectional view through a slider as formed-from the dies and prior to the completion of the formation thereof. Fig.. 3 is a section on the line 3-4 of Fig. 2. Fig. 4 is. a side view of the'device shown in Fig. 2 completely formed;

Fig. 5 is a view. similar to Fig. 4- showing'a modification.

Fig. 6 is a section on -the line 6-16 of Fig.5.

showing parts in differentipositions r a 7 is a view similar to Fig.' i showlng a InOdifiCSitiqllI I Figg g'is' a'section-'on 'thelihe "8 Fl Fig. 9 is a side and sectionalview o another form of slider which I 'e" ployl'f Fi -1, 0. is Vie form of construction.

other {form 'of construction;

ment an, the stringer ,0

.with the top'wall l6 atthe flaredend of the sl1der or, in other words, above theweb l8, and .1

the upper surface'of the wan of the-drawings =That is to try," in castingor molding. the slider portio'n'fthe samefis ea" as shown iILFiE-{Z} it being understood th :cross sectional form of the lug-*2 2 as" well as I of the: manufacturers, or *td meet 'ments offa person. i 1 sldevlgw. of ew ?1l-P?' 'P By originally formi' the construction'brokenv away and showing an 1 shown: in :Fig. 2 i t e drawirigsx'theoperatic thereon adjacent the aperture gain which the illustrating the type of cores employed in. the dies' in forming the slider; and,

Fig. 14 is a section substantially on 'the line l4ll of Fig.13.

In Fig. 1 of the drawings I,have shown for the purpose of illustrating the use of my invention parts of two separable fastener stringers Ill and I I, each having coupling links l2 and I3 attached to one enlarged or beaded edge thereof, the links being preferably made of plastic or thermoplas- 1'0 tic material, such for example as'cellulose acetate, and at H, I'have shown a slider also preferably made of plastic material, such for example as cellulose acetate which is also true of the finger-piece or pull I 5, which is coupled withthe 1'5 slider to facilitate the movement thereof, longitudinally of the stringers, to couple and uncouple" the same as in other devices of this kind. The slider, .in the construction shown v in Figs. 1 to 4 inclusive, consists of upper and lower side plates or walls I6 and I! which are flared at one end and contracted at the other end, the walls being joined centrally 'of the flared end in a substantially v shaped connecting web I8 which divides said end of the slider into independent channels I9 and 20, note'Fig. 3. These channels converge at the contracted end of the slider forwardly of the web l8 as is the common to move the same 'towardeach other in the operation ofint rlocking the links of opposed string- The slider llfas will appear, is formed from a single unitary die-cast body and in casting this body,.an elongated lug 22 is formed integral this lug extends forwardly and upwardly joining the wall l8 in a'curved portion-23 and terminat ing at its freeend in a downwardly or irifwardlyi.

- curved end 24, 'which 'i'snormally arranged above" lie slider in th man of attaching the' flif ger' piece "or'pull s therewith] is facilitated: sam ;'pu11- seen that the closed end of the pull may be passed over the lug 22, as shown in Fig. 2 of the drawings, and when so attached, the lug 22 is her or lug 22 in position. In the above described drawings.

operation, the curved end 23 of the 1118 may be heated sufficiently to facilitate the movement of the member 22 from the position shown in Fig.- 2 to that shown in Fig. 4. However, in some cases, this heating operation will not be essen: tial as the member 22 may be sprung into this position.

The slider shown in Fig. 5 of the drawings is substantially of the same construction as that shown in the other figures, with the exception that the lug 22a has a downwardly projecting lug, pin or finger 28 on the downwardly turned or extended end 24a thereof, which is adapted to pass through a relatively small opening 29 in the top wall of the slider to normally engage the links, or at least one of the links of a separable fastener, such for example, as the links l2, I3, in retaining the slider against longitudinal movement on the stringers. With this construction, the lug 220. will be formed in the same manner as forming the lug 22 in Fig. 2 of the The finger piece or pull i5a will be provided with a crosshead 25a, which will operate to raise the lug 22a now in the form of a spring arm to move the pin or finger 28 into inoperative position as the finger piece or pull is raised from the full line position shown in Fig. 5 to the dotted line position in said figure, It will appear from a consideration of Fig. 6 of the drawings that the crosshead 250. will act in the manner of a cam betweenthe top wall of the slider and the, spring lug 22a to force the latter outwardly.

In forming the arm 220, the curved end portion 23a thereof is heated in moving the same from an elevated position similar to that shown in Fig. 2 to the full line position shown in'Fig. 5 and held in the full line position during the chilling or setting of the arm, which will serve to support the arm at all times in the depressed or full line position, whereas said arm may be sprung or forced upwardly as above. stated. This vided, the wall of the slider including the arm 22a is unbroken. In fact, in the normal position of the arm 22a, the aperture 23 is covered or concealed externally of the slider.

In Figs. '7 and 8 of the drawings, I have shown a slight modification of the construction shown in Figs, .5 and 6, wherein the slider 30 is provided with an arm 22b'similar to the arm 22a but instead of being provided witli'one pin 23 to engage one stringer, the free end portion of the arm 22b is provided with two longitudinally and transversely spaced pins 28a to engage both stringers .lug 22 is disposed in order to give the desired strength and rigidity to the pull. It-wil1 thus be or to seat between the links of opposed stringers. In this constructiomI have also shown a fingerpiece or pull 3i, of what might be termed triangular form, the rounded portion 32 of which cooperates with the arm 22b to. raise and lower the same, whereas the cross portion or bar 3| of which forms a common finger grip.

In Fig. 9 of the drawings, I have shown another modiflcatio'n' wherein the slider 34 is provided with an arm 22c, similar to the arms 22a and 22b, and included in the arm 220 is a longitudinal metal plate 35 which may be cast therein to give added strength and spring properties to the arm, or this plate may be secured in position by a rivet pin 36 passed through one end portion thereof and by one or two pins 31 at the free end of the arm, the latter also forming lock pins of the slider and extending through an aperture 38 in the top wall of the slider.

In Fig. 10 of the drawings I have shown another form of construction which may be employed and. in this figure, 39 represents the slider and 22d the arm and, with this construction, a lock pin 40 is secured to or cast in the free end portion of the arm to project from the lower surface thereof through an aperture 4! in the slider 39.

In Figs. 11 and 12 of the drawings, I have shown another form of construction which may be applicable to any of the other sliders herein disclosed. In these figures, I have shown at 42 a slider, the inwardly extended flange of top and bottom walls 43 and 44 of which are cut out centrally as seen in Fig. 11 to form projecting bearing portions 46 and 41 at both ends of said flanges which are so formed as to frlctionally engage the tapes 48 and 48a of the separable fastener stringers adjacent the links 49-49:; attached thereto. With this construction the top and bottomwalls 4344 of the slider would be arranged in spaced relation to the upper and lower surfaces of the links to avoid contact therewith, With this type of construction the spring properties of a cellulose acetate slider will permit firm engagement with the tapes 43-48a to frictionally support the slider in different positions of adjustment on the stringers, while at the same time permitting free movement of the slider longitudinally of the stringers. The top wall of the slider 42 is also provided with a finger piece supporting part 45 partially illustrated in Fig. 11 and shown in section in Fig. 12.

In Figs. 13 and 14, I have diagrammatically illustrated the arrangement of dies and core members for the dies in die-casting the sliders shown in the other figures and, in Fig. 14, I have shown in section the two die parts 505lia which are movable toward and from each other, the parting line of the die parts being indicated at 5!, at which parting line is a gate passage 52 through which the casting material may be introduced into the impression 53 of the die from a suitable nozzle 54.

Arranged within and movable transversely of the movement of the die parts ill-50a are core parts 55-55a which are of the general contour shown in Fig. 13 of the drawings. It will, of course, be understood thatthe shape of the die parts and the core members will be modified to suit various types of sliders tobe formed, and

those diagrammatically illustrated in Figs. -13 and .14 of the drawings are only to demonstrate the the manner illustrated in Fig. 2 of the drawings and later brought into the desired relationship between the adjacent walls of the slider as previously set forth.

Having fully described my invention, what I claim asnew and desired to secure by Letters Patent, is:

1. A thermoplastic slider of the character described having spaced side walls, ,an outwardly projecting freely flexing elongated lug integral with one side wall of the slider adjacent one end thereof and extending from the surface of said wall within peripheral edges thereof, the free end of said lug extending inwardly and being normally separated from said wall, a finger piece coupled with said lug by movement over the free end thereof, said inturned end of the lug being moved into juxtaposition to said side wall of the slider in forming on said wall of the slider a substantially closed elongated loop retaining the finger piece against accidental displacement from the slider, a projection on the free end of said lug normally projecting through an aperture in said wall of the slider, said lug having spring properties whereby the free .end portion thereof is movable toward and from said wall of the slider in moving said projection into operative and inoperative position, and means on said finger piece cooperating with the lug to flex the lug outwardly in the operation of grasping said finger piece.

2. A thermoplastic slider of the character described having Spaced side walls, an outwardly projecting freely flexing elongated lug integral with one side wall of the slider adjacent one end thereof, the free end of said lug being arfinger piece cooperating with the lug to flex the lug outwardly in the operation of grasping said finger piece, and said projections being disposed at opposite sides of said lug.

3. A thermoplastic slider of the character described having spaced side walls, an outwardly projecting freely fiexing elongated lug integral with one side wall of the slider adjacent one end thereof, the free end of said lug being arranged adjacent said wall, and forming a substantially closed loop, a finger piece movably mounted on said loop, a projection on the free end of said lug normally projecting through an aperture in said wall of the slider, said lug having sprin properties whereby the free end portion thereof is movable toward and from said wall of the slider in moving said projection into operative and inoperative position, means on said finger piece cooperating with the lug to flex the lug outwardly in the operation of grasping said finger piece,

and the projection on said lug comprising a mesilient properties normallysupporting the free end portion thereof in juxtaposition to said member while permitting fiexure of the free end of the arm away from said member, said wall member being apertured adjacent the free end of said arm, and the free end of said arm having a part projecting through the aperturein said wall member to engage at least one of the fastener stringers to retain the slider against movement thereon. v

5. The combination with a cellulose acetate slider for separable fastener stringers of the character described, of a cellulose acetate arm fixedly attached at one end to the outer surface of one wall of the slider adjacent one end thereof, said arm extending longitudinally of the slider, the other end of said arm being free and movable toward and from said surface of the slider by reason of the resilient properties of the material employed in said arm, the free end of the arm being directed inwardly and disposed adjacent said surface of the slider and forming in conjunction with said surface a substantially closed elongated finger piece supporting loop, a lock pin on the free end of said arm adapted to project. through an aperture in the slider to engage one of the stringers to retain the slider against movement thereon, and means having a swinging and sliding movement on said arm and cooperating with the slider and arm to move said pin out of engagement with said stringer.

6. A slider for separable fastener stringers employing stringer tapes having interengaging coupling links adapted to be coupled and uncoupled by the longitudinal movement of the slider on said stringers, said slider comprising spaced wall members having inturned flanges forming channels through which the links of the stringers are adapted to pass, said slider comprising a body of cellulose acetate, one wall of the slider having a cellulose acetate arm arranged longitudinally thereof, one end of the arm being fixedly attached to the outer-surface of said wall' member, the other end of the arm being free and movable toward and from said wall member by virtue of the yieldable and resilient properties of the material employed in said arm, said wall members by reason of the yieldable and'resilient properties of the material employed therein being movable toward and from each other t yieldably engage the stringers in the movement of the slider longitudinally thereof, and the inturned flanges of the wall members of the slider being recessed intermediate the ends.thereof to reduce the bearing surfaces of the flanges upon said stringer tapes.

'7. A slider for separable fasteners of the class described, said slider comprising a body of thermosplastic material having resilient properties, said body having spaced side walls and an outwardly projecting elongated lug integral with one side wall of the slider adjacent one end thereof and extending from the surface of said wall within peripheral edges thereof, said lug having a long straight portion arranged in spaced 7 parallel relation to said wall, an inwardly extending integral part at the free end of said lug arranged in abutting relationship to said wall forming thereof an elongated finger piece retaining loop, and said lug by reason of the inherent properties of said thermoplastic material being resilient and freely movable toward and from said wall thereby facilitating the attachment of a finger piece with the lug of said slider.

DAVIS MARINSKY. 

